Fmuser -1000/500C 1KW Digital FM Broadcast Transmitter User s Manual

Transcription

1 Fmuser -1000/500C 1KW Digital FM Broadcast Transmitter User s Manual 1

2 Please notice this: 1. Read safety notice first 2. A 50 Ohm dummy load or antenna and cable must be connected before turning power on, avoiding water going into the connecters or the cable. 3. Please read System Control Logic section to fully understand how the system works. 4. Please read the Power On Sequence. 2

3 Contents Safety Notice 1. Overview Technical Specifications System Structure and Function Test Instrument Test and Maintenance Panel Function Description Power on Sequence System Control Logic Description for software use Indicator light Failures Check

4 Safety Notice 1. Please read the following safety points, in order to avoid the accidents and prevent the connecting machines to be broken. 2. Only the qualified maintenance workers can operate the service. 3. Prevent the fire and the bodily injury. a. Use the proper wire. If not, it will cause the fire and the bodily injury; b. Ensure the machine connect the ground. Please confirm whether the machine has connected the ground, through the wire and the lead, to prevent the electric shock; c. Use the proper fuse. Please use the stipulated type and rating fuse; d. Provide good ventilation. This machine adopts the natural convective radiation. Fix it correctly to keep it radiating well. 4. Please don t disassemble and repair by yourself when it s broken down. Please send to the professional service department to solve the problems. CAUTION:Please don t assemble the machine in the moist environment; Please don t assemble the machine in the easy exploding environment; Please don t repair by yourself. 4

5 1. Overview 1000/500C digital FM broadcast transmitter, combining with audio modulation and 1KW power amplifier, is an excellent digital product that owns the highest and newest technology. The whole machine adopts the latest digital signal processing and the direct digital synthesized technology. This advantage provides us with excellent hearing feature which can match to CD audio quality /500C digital FM broadcast transmitter runs with perfect performance. Its technical specifications like THD, Audio Frequency Response, SNR, Stereo Separation or other Technical Specifications are complete meet FM Transmitter s National Standard & Industry Standard, and as a new type of high-tech Digital Product, a lot of its Technical Specifications are better than National Standard & Industry Standard. 1000/500C digital FM broadcast transmitter is composed of five parts: Power Supply, Main Control and Display Cell, Audio Processing and Frequency Synthesizing Cell, Power Control Center, and Power Amplifier Cell. It is fitted in the 3U, 19 inches standard case. All the output and input signal is lead from the back panel. 1000/500C series has password protected function to protect some important parameters from accidentally or incidentally changing. 1000/500C series transmitter has analog and AES/EBU audio interface and SCA interface. It is a full band FM transmitter from 87.00~108.00MHz step 10kHz /500C digital FM broadcast transmitter provides a serial communication interface, in order to build a Remote System easily. 2. Technical Specifications Electrical Specification RF Frequency Output Power 87.00MHz~108.00MHz Step 10kHz Continuous adjustable to setting power Power Accuracy <±10% Power stability <±3% Output Impedance 50Ω 5

6 RF Output connector SFDR Residual Amplitude Modulation Carrier Frequency accuracy N-50K <-70dB <-50dB ±200Hz Frequency Stability: 1x10-6 Modulation Deviation Pilot Frequency Pilot Amplitude Analog Audio Input Impedance Audio Input Level Digital Audio Input Impedance Digital Audio Input Level Digital Audio Sample Rate Audio gain Pre-emphasis LR Channel Level Difference Frequency Response THD Stereo Separation SNR Power Supply Heat dissipation 0~120KHz (100% ±75kHz) 19kHz±0.1Hz 0~12KHz (10% 7.5K) 600Ω Balance -12dBm~+8dBm, Step 0.1dBm 110Ω Balance (optional) 0.2~10Vpp (optional) 30kHz~96kHz (optional) -15dB~+15dB step 0.1dB 0μs 50μs 75μs <0.1dB(100% Modulation) <±0.1dB, 30Hz~15000Hz <0.1%, 30Hz~15000Hz >50dB(type.), 30Hz~15000Hz >70dB(type.), 1kHz 100% Modulation AC180V~AC260 47Hz~63Hz Forced ventilation Physical Specification Casing Size Weight Ambient temperature 3U(484mm 88mm 600mm) 19Inch 31.5±0.2kg 5 ~+40 Relative Humidity <95% Sea Level Height <4500m 6

7 3. System Structure and Function ZHC618F-1000C digital FM broadcast transmitter is composed of five parts: Power Supply, Main Control and Display Cell, Audio Processing and Frequency Synthesizing Cell, Power Control Center, and Power Amplifier Cell (it is showed by Figure 3-1 ). The Power Supply changes the 220V AC to all kinds of DC for other parts of transmitter. Main Control and Display Cell is an interface between users and the machine. It puts all information about transmitter on the LCD, and users can configure the transmitter via pressing the key buttons. Audio Processing and Frequency Synthesizing Cell is the core of the transmitter, This part does pilot stereo code, pre-emphasis, and audio gain for inputting audio signal which can be analog or AES or SCA by using digital signal process technology, and meanwhile, it using direct digital synthesis technology to get frequency which users want. Power Amplifier Cell contains Driver, Power Distribute, Amplifier, Power Combiner, Filter, Power Monitor. Power Control Center Controls output RF power at a value form Main Control and Display Cell, according as sampling value of power, voltage, current, temperature. At the same time, it sends sampling value to Main Control and Display Cell to display. 7

8 Analog Input L R ADC Digital Signal Processing (DSP) direct digital synthesis (DDS) Digital Input SCA Input AES/EBU SCA (Digital Filter, Stereo code, Digital Pre-emphasis Audio Gain) Band-pass Filter Micro Process(MCU) Com LCD Interface Display Key Buttons Power Filter, Sample, Power Control Driver Power Amplifier Filter 220V AC Input Power Supply Power Monitor RF Output 8

9 4. Test Instrument Name Type Specification Manufacturer Universal Counter 53132A 225MHz,12 words Agilent Spectrum Analyzer 8560E 30Hz~2.9GHz HP Digital Oscilloscope TDS MHz Tektronix FM Demodulation FMAB 100KHz~5.6GHz RS Stereo Decoder FMAB 100KHz~5.6GHz RS Audio Analyzer P1DD Analog and digital Audio Precision Wattmeter MODEL 43 0~1KW Bird Table 4-1 Test instrument for -1000/500C transmitter 5. Test and Maintenance -1000/500C Digital FM Transmitter is a high performance Transmitter, its Technical Specifications are complete meet FM Transmitter s National Standard & Industry Standard, and as a new type of high-tech Digital Product, a lot of its Technical Specifications are better than National Standard & Industry Standard. 5.1 Performance Test ZHC618F-1000/500C Digital FM Transmitter is the Compact product. So it only needs One-Time Testing of the Entire Machine, if the testing report doesn t meet its technical specifications by the same accuracy instrument, please repair it in professional department or original manufacturer. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 9

10 5.1.1 Audio Performance Test Audio Audio Analyzer Audio FM Demodulation RF Transmitter RF Wattmeter RF Dummy Load Figure 5-1 connecting for audio analyze a. Connect transmitter and test Instrument with cable according Figure 5-1. b. Make audio analyzer output 400Hz, 0dBm; c. Finely adjust audio output level until demodulation reaches 75KHz (100% modulated); d. Scan audio output frequency from 30Hz to 15kHz, record frequency response (< ±0.1dB) and distortion (< 0.1%); e. Scan audio output frequency from 30Hz to 15kHz, record stereo separation (typical > 50dB); f. Set audio analyzer to 1kHz, exciter pre-emphasis to 50μs, demodulator to 50μs de-emphasis, adjust audio analyzer power output until demodulation reaches 75KHz, record mono SNR(>75dB) and stereo SNR (>70dB) Carrier Frequency Accuracy Test Transmitter Wattmeter Dummy Load Attenuator Universal Counter Figure 5-2 connecting for carrier frequency test a. Connect the test instrument to transmitter according to Figure 5-2; b. The test carrier frequency accuracy (±200Hz). USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 10

11 5.1.3 Harmonic Suppression Transmitter Wattmeter Dummy Load Attenuator Spectrum Analyzer Figure 5-3 connecting for spectrum analyzer a.connect the test instrument to transmitter according to Figure 5-3; b.record harmonic suppression relative to carrier (<-60dB). 5.2 Maintenance It needs to use new fans instead of the old ones which have worked more than hours. If the digital FM broadcast transmitter works at a very dirty environment, for example a place with much of dust, it must be to replace fans ahead of schedule. 6. Panel Description 6.1 Front Panel USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 11

12 6.2 Back Panel 7. Power On Sequence 7.1 Open the package, check appearance, switch, key button, socket, and interface port on front and back panels. 7.2 Turn power switch on the OFF position and connect power cord to power source. 7.3 Connect RF out port to a 50 Ohm dummy load or antenna through a cable. 7.4 Turn power on. 7.5 Set RF logical control (see detail in System Logic Control). 7.6 Set RF power. 7.7 Set parameters such as frequency, digital/analog audio input select, stereo/mono select, audio gain, modulation deviation, pre-emphasis. 7.8 Turn on RF power. 8. System Control Logic 8.1 RF Output Control The RF output of ZHC618F-1000/500C digital FM broadcast transmitter is controlled by switches: RF Switch in main menu and period control switch in RTC menu. RF Switch: When RF Switch is off, turn off RF power. When RF Switch is on and Period Control is disabled, turn RF power on to setting power. When RF Switch is on and Period Control is enabled, RF power is controlled by Period USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 12

13 Control function (see Period Control). Period Control: When RF Switch is on and Period Control is enabled, the control method is as follow: The system reads current time through RTC and check whether current time is falling into any of the three periods. If yes; turn on RF power to its setting power. Else turn off RF power. A period is invalid if start time is greater than or equal to end time. Current time will never fall into an invalid period. If three periods are all invalid, turn RF power off for ever. 8.2 Remote Control Remote control is set in <SET> menu. When remote control is enabled, remote LED on front panel is lit and parameters are controlled by remote host and can not be changed locally except Remote flag in <SET> menu. Updated parameters will be automatically stored in EEPROM. When remote is disabled, remote host can not control over the exciter but locally does. Updated parameters will be automatically stored in EEPROM. RS232 or RS485 are used for remote control. Before enabling remote control, baud rate and device address should be properly set. 8.3 Change RF Frequency After RF frequency changed, RF power will drop to 0 first, and then increase to its setting power. 8.4 Time Period Modification It is suggested that disable Period Control before correcting date and time or changing period s start and end time to avoid instantaneous undesired RF power on and off. 8.5 System Protection In some urgent cases such as exceeded forward power, reflect power, current and over temperature, system will reboot. If it is failed successive 3 times, the system will automatically turns off RF power and just acts display function. System will also shut down when some main parameter can not be set such as frequency, digital/analog audio select. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 13

14 9. Direction for Software Use 9.1 General Description Buttons : Up or increase, when pressed and held for a longer time, it speeds up. : Down or decrease, when pressed and held for a longer time, it speeds up. : Enter, used to select menu and enter edited parameter Menu classification There are three kinds of menus: display menu is display only menu; select menu used to select sub menu or goes back to its main menu; edit menu used to enter parameters or configure the system. How to enter parameter Just scroll highlight bar to desired edit item and press, use or to change parameter and press again to save it. Some important parameter or operation may need further confirmation. In this case, a Y or N will appear after editing at the end of the edit line. Use or to select Y (confirm) or N (cancel) and press to save updated parameter or cancel it. Parameter can not be modified locally when remote is enabled except Remote itself Return to Main Menu When there is no operation (press button) for a long time, system will return to its main menu automatically with LCD backlight off. Not saved updated parameter will be replaced with its old value LCD backlight LCD backlight will be automatically turned off when there is no operation for a long time and turned on immediately when any key is pressed. 9.2 Pages Description System Boot Up USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 14

15 Figure 9-1 Page of system boot up During the system boot up, company logo is displayed and all LED on front panel blinks 4 times (power LED is on). After system booting up, it enters to the page displaying frequency and power set Setting parameter display Figure 9-2 The Page displaying setting parameters Frequency and Power set percent, the most important setting parameters, appear in this page. after that, when this page is disappeared,the system will slowly increase output power; if users do not accept these two parameter, it s should to keep any of the keys in push more than 5 seconds, then when it enters the main menu page, in will not to transmit any power Main menu page Figure 9-3 Main menu page Figure 9-3 shows main menu page. The audio bar displays at the left of the page. The scale means modulation deviation. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 15

16 This page contains the parameter as following: RF SWITCH: RF switch control select between ON or OFF. FWD POWER: forward power display only. RFL POWER: reflected power display only. FREQUENCY: RF frequency display only. AUD GAIN: left and right audio gain display only. [VIEW] [STATUS] [SET] parameter data browse menu, see [VIEW] menu. system running status, see[status] menu. parameter setting menu, see [STATUS] menu Page of VIEW USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 16

17 Figure 9-4 Page of VIEW Figure 9-4 shows the all parameters in the VIEW page. In the VIEW page, users can only browse the parameters. If users want to modify the parameters, it should to be enter the SET page. FWD POWER: RFL POWER: FREQUENCY: MODU DEV: AUD GAIN: AUDIO INPUT: PRE-EMPHASIS: PILOT DEV: AMP VOLTAGE: DRV CURRENT: Forward power. Reflected power. RF frequency. modulation deviation. audio gain. audio input and modulation mode, see [Set] menu. pre-emphasis. pilot deviation; amplifier voltage (48V in normally). current of driver amplifier. AMP CURRENT A: current of amplifier module A. AMP CURRENT B: current of amplifier module B. AMP CURRENT C: current of amplifier module C. AMP CURRENT D: current of amplifier module D. TEMPERATURE: BAUDRATE: ADDRESS: REMOTE: DATE: TIME: PERIOD CTRL: temperature of amplifier baud rate used for serial communication. device address used for remote control. remote control switch. date time. period control. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 17

18 [EXIT] return to its parent menu Page of STATUS Figure 9-5 Page of STATUS Two pictures in Figure 9-5 show the status of all parameters, users can find out the system is running normally or not. RF OUTPUT: Normal/OFF/Drop; Refer to control logic section. Normal: RF output is in normal status. OFF: RF power is off. Drop: RF power can not achieve to its setting power. SYSTEM: Normal/Error Indicate system errors. Contact equipment provider when error happens. FWD POWER: Normal: Warning: Normal/Warning/Protect forward power is normal. forward power is higher than setting power. Protected: forward power is too high, RF power is turned off. RFL POWER: Normal/Warning/Protect/Protect H Normal: reflect power is normal. Warning: reflect power is high, may cause RF power drop. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 18

19 Protected: reflect power is too high, RF power is turned off. AMP VOLTAGE: Normal/Warning/Protect Normal: amplifier voltage is normal. Warning: amplifier voltage is high, may cause RF power drop. Protected: amplifier voltage is too high, RF power is turned off. DRV CURRENT: Normal/Warning/Protect Normal: amplifier driver current is normal. Warning: amplifier driver current is high, may cause RF power drop. Protected: amplifier driver current is too high, RF power is turned off. AMP CURRENT A: Normal/Warning/Protect Normal: amplifier module A current is normal. Warning: amplifier module A current is high, may cause RF power drop. Protected: amplifier module A current is too high, RF power is turned off. AMP CURRENT B: Normal/Warning/Protect Normal: amplifier module B current is normal. Warning: amplifier module B current is high, may cause RF power drop. Protected: amplifier module B current is too high, RF power is turned off. AMP CURRENT C: Normal/Warning/Protect Normal: amplifier module C current is normal. Warning: amplifier module C current is high, may cause RF power drop. Protected: amplifier module C current is too high, RF power is turned off. AMP CURRENT D: Normal/Warning/Protect Normal: amplifier module D current is normal. Warning: amplifier module D current is high, may cause RF power drop. Protected: amplifier module D current is too high, RF power is turned off. CUR BALANCE: Normal/Warning/Protect, status of unbalance current between 4 amplifier modules. Normal: unbalance current is normal. Warning: unbalance current is big, may cause RF power drop. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 19

20 Protected: unbalance current is too big, RF power is turned off. TEMPERATURE: Normal/Warning/Protect Normal: temperature is normal. Warning: temperature is high, may cause RF power drop. Protected: temperature is too high, RF power is turned off. [EXIT] return to its parent menu PASSWORD CHECK Figure 9-6 Page of password check Check password before entering [Set] and [Preset] menu When Password Check is enabled. Enter password in Password first, and then select [Sure]. If correct password is entered, it will enter to desired menu. Else it will display Wrong password, try again. Select [Cancel] to give up password enter and return to its previous menu. The initial password is , if need a new password, refer to Password menu SET Menu Figure 9-7 SET menu Audio bar is located on the left side of the screen, it indicates dynamic modulation deviation. 100% denotes 75KHz modulation. Broadcast: broadcast parameter setting, see Broadcast menu. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 20

21 General: RTC: Password: Preset: [EXIT] system parameter setting, see General menu. date, time and period control setting menu, see RTC menu. change password menu, see Password menu. load default parameters, see Preset menu. return to its parent menu BROADCAST Menu FWD Power: Figure 9-8 Page of BROADCAST Menu forward power, display only, used to watch real output power when adjusting output power percentage. RFL Power: forward power, display only, used to watch real output power when adjusting output power percentage. Power Set: Frequency: Modu Dev: Aud Gain L: Aud Gain R: Audio Input: set the percentage of output power. set RF frequency. set modulation deviation. set left audio gain. set right audio gain. D/Mono mono modulation, audio from left digital channel. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 21

22 A/Mono mono modulation, audio from left analog channel. D/Ster stereo modulation, audio from digital channel. A/Ster stereo modulation, audio from analog channel. Pre-emphasis: Pilot Dev: [EXIT] select pre-emphasis. set pilot deviation. return to its parent menu GERNERAL Menu Baud Rate: Address: Remote: [EXIT] Figure 9-9 Page of GERNERAL Menu select baud rate for remote control. set device address for remote control. enable or disable remote control. return to its parent menu RTC Menu Date: Time: Period Control: ON Period1: Figure 9-10 Page of RTC Menu Set or display date. set or display time. Enable or disable period control. set first period. ON Period2: set second period. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 22

23 ON Period3: [EXIT] set third period. return to its parent menu PRESET Menu Figure 9-11 Page of PRESET Menu [Preset] menu is used to load default parameters. Make sure that some parameters may need to be adjusted after Preset according to your broadcasting requirement. Select [Sure] to load default parameters. Select [cancel]to return to Main menu. Preset default parameters: Frequency: MHz Power Percentage: 0.0% Audio Gain: Audio Input: Pre-emphasize: Modulating deviation: Pilot deviation: AGC: Baud rate: 0 db Digital audio, stereo modulation. 50 us 75.0 KHz 7.5 KHz enable 9600 bps Address: 0 Remote: Period Control: OFF OFF Password: USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 23

24 PASSWORD Menu Figure 9-12 Page of Password set Change password: enter new password in New edit box, and enter the same new password again in Again box. If two enters are the same, it will display change password successful, else display Different password, try again!. Just select [EXIT] if do not want change password. The initial password is Password Control:Enter [Set] and [Preset] menu need password checking when Password Control is ON ; there is no password check when Password Control is OFF. [EXIT] return to its parent menu. 10. Indicator light At the left side of the front panel, there are 8 LED lamps used to indicate all kind of system status. Three of them are green, one is yellow, and the other four is red. If one of the red lamp is light, it means that there is something wrong, users can find out the problem at the [STATUS] menu Lamp for Power on When it is power on, the voltage of 5V is supplied normally, this green lamp is luminous Lamp for RF When the RF SWITCH in the main menu is set to ON, and the POWER SET percent is more than 0, this green lamp is light Lamp for AUDIO If the audio input mode is set to be the stereo, the lamp is light. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 24

25 10.4 Lamp for REMOTE In the page of General Set, if Remote is enabled, this yellow light is illuminant Lamp for TEMP When the amplifier temperature is higher than 65, the red lamp is light; higher than 70, to decrease temperature, and to protect amplifier, the system will try to decrease output power; if temperature exceeds 75,it will power off immediately Lamp for VSWR If reflected power is higher than 5% of rated power, the lamp is light; higher than 7% of power, it will decrease output power to decrease reflected power; when it is higher than 100W, it may happen that: the software power off the output, or the hardware circuit switch off the power supply, then power on again Lamp for GENERAL If this lamp is light, it may happen that: forward power is more than 103% of rated power, voltage of power supply is lower than 47.5V or higher than 50V, driver current is higher than 1.0A, at list one amplifier mode current is higher than 9.5A, the unbalance current is more than 5.3A. if forward power is more than 107% of rated power, voltage of power supply is higher than 52V, driver current is higher than 1.2A, at list one amplifier mode current is higher than 11A, the unbalance current is more than 5.6A, the system will try to decrease RF power. If in sometime, system cannot change this status, it will shut down, then power on automatically. Worse, if forward power is more than 110% of rated power, voltage of power supply is higher than 55V, driver current is higher than 1.4A, at list one amplifier mode current is higher than 11A, the unbalance current is more than 6.0A, it will shut down at once. If the voltage of power supply is less 47.5V, the output power will play down and the fans will turn slowly, to let system work better, it will decrease RF power to get power back to 48V Lamp for RF MUTE It means nothing for this mode of equipment. USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 25

26 11. Failure Check 11.1 Turn on the power supply, but the equipment doesn t work it may: The fuse is broken: change the fuse; The plug is not inserted tightly or contacted fault: insert the plug tightly No audio output The source of audio signal is not connected: check the wire to ensure it has been connected correctly. Choose the wrong source of the signal: please choose the correct source of signal, digital or analog Other Failure If there is any other problem that can not be solved, please contact with us USER S MANUAL FOR ZHC618F-1000/500C TRANSMITTER 26